Hello,
the knob I am using has 35 mm/0.1378 inch maximum diameter and 18 mm/
0,071 inch minimum diameter and is 52 mm/0,2048 inch long. The size
and shape is taken from an instrument made by Jean Noel Grandchamps
1977 which was my first hurdy gurdy.
This knob is rather small compared to whats arround today, but I like
it as it easily can roll inside my hand (and that is quite big).
Simon
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have a look at:
http://hurdygurdywiki.wiki-site.com
http://drehleierwiki.wiki-site.com
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my site:
http://simonwascher.info